How to set multiple camera views in one scene?
Yes.

You can create new cameras with ShiftA> Camera, or you can just duplicate an existing camera with ShiftD.

To name them, enter a name in 3D view > Properties region > Item, and optionally enable  Name in Properties editor > Object > Display to display the name in the 3D view:



The active camera (the one used when you press Numpad 0 or render) is the one with the solid triangle.

To set a camera as active, select it and press CtrlNumpad 0, or select it in the scene panel with a search-able list drop down:



Another useful shortcut is CtrlAltNumpad 0, which snaps the active camera to the current view.

You can lock the transforms of the camera object to prevent moving them in the 3D view:



However you can still move them with the transform sliders in the interface.